We buy lots in bulk. We like Costco for bulk buying.
It can be a money saver, but you need to check prices to be sure you're getting a good deal.
Definitely need to know your prices if you're shopping there. Some things are a steal wheras I know I can get other things cheaper elswhere when they're on special.
We buy (from Costco)
Indome or other 2 min noodles, box of 30 for $7
quinoa, cheapest I've found it anywhere.
baked beans and some tinned beans like kidney and 4 bean mix (for convenience)
eco washing powder
glad wrap and alfoil (won't need any more for years!)
sliced and grated cheese
I still try to buy the products I want, Australian made and owned, degradable etc. and just buy what I can from there and get other things elsewhere.
Bulk meat I get at the free range butcher and fruit and veg bulk packs as much as possible (or things that will keep longer) and also all my dried legumes, nuts, seeds, cereal etc. from the market near us.